import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import User from '../components/user/User.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/', redirect: '/login' },
  // 定义 使用路径/时自动重定向到/login
  { path: '/login', component: Login },
  {
    path: '/home',
    component: Home,
    // 为一个组件添加子组件时，路由添加子路由并定向,然后在组件中使用路由占位符router-view，就会显示定向的内容
    redirect: '/welcome',
    children: [
      { path: '/welcome', component: Welcome },
      { path: '/users', component: User },
      { path: '/rights', component: Rights },
      { path: '/roles', component: Roles }
    ]
  }
]

const router = new VueRouter({
  routes
})

// 路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转过来
  // next 是一个函数，表示放行
  //  next() 放行   next('/login) 强制跳转到
  if (to.path === '/login') return next()
  const tokenstr = window.sessionStorage.getItem('token')
  if (!tokenstr) return next('/login')
  else next()
})

export default router
